Friction brake



' p 29- J. s. THOMPISQN FRICTION BRAKE Filed sept. 24, 1926 Patented Sept. 24, 1929 UNITED STATES "PATENT orrlcsf JAMES s. 'rnomrson, or NEW Yonx, n. Y., ASSIGNOR T AMEItICAN 1mm mhrE- mars conroaarroiv, or new YoaK, n. Y. A conronarron or NEW YORK rmc'rron BRAK Application filed September 24,1926. Serial No. 131,416.

This invention relates to friction brakes and while it is particularly adapted for expanding brakes arranged to make frictional contact with a drum, which is a form of brake commonly employed in automotive vehicles, it is also useful in many other installations as will be apparent to those skilled in the art. v

The object of the invention is primarily to provide novel means of simple construction which are adapted to be easily applied for securely holding a friction shoe in fixed pos1- tion on the brake head;

And another object of the invention is to provide novel means forsecuring a friction shoe on a brake head which will not work loose or otherwise release the shoe under ordinary conditions of service.

In the accompanying drawings I have illustrated a selected embodiment of the invention and referring thereto:

Fig. 1 is partly in section and shows that.

portion of a brake head on which theshoe is seated-andsecuredby this invention; /Fig. 2 is a plan viewof Fig. 1.

ing keeper.

Fig; 4 is a sectional'view on the line H .ofFi.2.

Re erring to the, drawings 5 is the brake head having a seat -6-for the shoe' 7. I do not limit myself to any particular construction of these parts since it will be apparent that the invention ma be employed with dif- ,ferent heads and di erent shoes. For the urposes of this application I have shown a head having a seat 6 co extensive with the back of the shoe, and I have shown a shoe.

- having a composition body 8 and a metal back 9 attached 'thereto,- the ends of the body being recessed at 10.- a

A keeper is engaged with each recessed end ofthe shoe and is fastened to the head I for securing the shoe rigidly in place on itsseat against movement in any direction. The

- keeper'llis a castin having a longitudinal channel 12 closed at 1ts ends by webs 18 and rovided with an intermediate web 14. The

- ee or has a lug 15 to fit-withi'nthe recess 10 oft e shoe and it is preferably made to make Fig. 3 is a perspective viewof the fastenthe head and, the channeled part of the kee 60 ers for securing the keepers rigidly to t e head.- The 111 15 on each keeper engages that part of the metal back 9 which 1s located in the recess 10, and this part .of the back is preferably folded on itself, as shown in Fig. 1, to provide additional strength where the keeper engages the back. The edge of the keeper oppos1te the lug 15 is made 1n the form of a lip or flange 22 which en ages. the transverse shoulder 23 I on" the sad, '70 whereby the keeper is firmly seated with its lug clamping the metal back of the shoe against the seat on the head, and its 1i or flange'engaged with the transverse shou der I on the head, and the boltspassing throu h 75. the channel part of the kee r and t e grooved part of the head.v e head 24 of each bolt is rounded on its under side to fit the channel in thekeeper, and the head is preferably rectangular in shape so that it w1l1 enga the curved wall forming the channel 0 the keeper and be prevented from turmn The nut 25 for each bolt enga s -a flat s oulder 26 on the head, and a suite le washer maybeprovided'whenever desired. 8

The invention provides a kee er of simple construction'which can be easi y and accurately made, which does not require chinng to any material extent if at all, which is adapted to be securely fastened tothe head to hold the shoe in rigid position on the seat against movement .in. any direction. The channeledor vrounded part of the keeper has a bottom face described on anarc of greater degree than that of the groove in the head so that there will be a clearance between the bottom of the oove and the keepler which will permit the eep'er to yield slig tlywhen the nuts are tightly adjusted on the bolts V whereby the keepers. will securely and rigidl y hold 166 the groove and engagingthe' shoe, passing through the grooved part of the head the shoe on the head, and the nuts are more securely held on the bolts.

The lugs engage the metal back of the shoe to hold it on its seat against any tendency to move outward, but I do not rely u on engagement of the lugs with the metal ackto prevent lateral or longitudinal movement of the shoe on its seat. The parts are preferably made so that the lugs will engage the back and the end walls of the recesses, and the shoulders 18 on the. keepers will engage the end projections 19 on the shoe, to prevent lateral and lon itudinal movement of the shoe on its seat. ut, if found desirable, the lugs may be made so-that they will not enage the back wall of the recesses, and the shoulders 18 engaging the end projections 19 may be relied uponto prevent endwise movement of the shoe on 1ts seat; or this end wise movement may be prevented by engagement of the lugs with the back wall of the recess and Without providing definitely for engagement of the shoulders 18 with the end pro'ections 19. I prefer to make the arts sot at-the lug will engage the back an end walls of the recess and the shoulders 18 will engage the-end projections 19. The end Webs 13 and the intermediate web 14 are provided to stren hen the keeper, but in some embodiments 0 the invention these webs, or. any of them, may be omitted, or more webs may be usedi'f found desirable for'greater strength. Myv invention can be embodied in various forms in brake assemblies of many kinds for different installations, and it can be embodied with different shoes and with different heads, and I reserve the'right to make all modifications and adaptations of the invention that ma be covered by the following claims. to

' claim: 1. A keeper for securing a friction shoe to a brake head and having a channeled part with a bolt opening therein, and a lateral pro- I jection for engaging the shoe.

2. A keeper for securing a friction shoe to a brake head and havinga lug-on one side,-a

lip on the opposite side, and a channeled part head and engaging thekeeperfor securing intermediate of the lug and lip. I

3. A keeper for securing a friction shoe to a brake head and havingia channeled part, a lateral projection for engagin the shoe, and a web bridging said channeled part to reenforce and strengthen the same. I 4. .A keeper for securing a friction shoe to a brake head and having a channeled part, a

lateral projection for engaging the shoe, andw'ebs at the ends and between the ends of said channeled part.

0 5. The combinatlon of a brake head having W a shge seat thereon and a transverse groove at an end of the-seat, a shoe engaging the seat,

Y a keeper in the groove and projecting beyond and a bolt 1 having a rounded part,

part of the head and the v and the keeper for securing the keeper to the head.

6. The combination of a brake head having a shoe seat thereon and a transverse groove at an end of the seat, a shoe engaging the seat, a keeper bridging the groove in the head and engaging the ing through the grooved part of the head and the keeper for securing'the keeper to the head.

7 The'combination of a brake head having a shoe seat thereon and a transverse groove at an end of the seat, a shoe engaging theseat, a keeper engaging the shoe and bridging the groove in the head, said keeper and a bolt passing through the grooved rounded part of the keeper to the head.

8. The combination of a brake head having a shoe seat thereon and a? transverse groove at an end of the seat,a shoe enga ing the seat, a keeper engagin groove in the hea said keeper having a channeled part to enter said groove and transverse webs in said channeled part, and a bolt passeeper for securing the ing through the grooved part of the head and the channeled part of the keeper for securing the keeper to the head.

9. The combination of a brake head having a shoe seat thereon and a transverse groove at anend of the seat, a shoe engaging the seat, a keeper engaging the shoe and bric g-' ing the groove in the head, said keeper having a channeled part to enter said groove and transverse webs at theends and between the ends of said channeled part, and a boltpassing through the grooved part of the head and the channeled part of the keeper for securing the keeper-to the head. v

10. The combination of a brake head having a shoe seat thereon and a transverse groove at an end of the seat, a shoe engaging the seat, a keeper bridging the groove in the shoe, anda bolt pass-.

the shoe and bridging the head and having a lug engaging the shoe at i one side of the groove and a lip engaging the head atthe other side of the groove, and a bolt passing through the grooved part of the the head at the other side of the groove, said kegper having a rounded part between the lug an the lip, and a bolt passin through the grooved part of the head an the rounded,

part of the keeper for securing the keeper to l the head: 4

12. The-combination of abrake head having a shoe seat thereon and a transverse groove at an end of the seat, ashoe engagingthe seat, a keeper engaging the shoe and bridging the groove in the head, said keeper having a rounded part-arranged in the groove in the head, there being a clearance between a the bottom of the groove and the rounded part of the keeper, and a bolt passing through the grooved part of the head and the rounded part of the keeper for securing the keeper to the head.

13 The combination of a brake head having a shoe seat thereon and a transverse roove at an end of the seat, a shoe engaging. t e seat, a keeper having a lug engaging the shoe and a lip engaging the head, the keeper being"rounded between-the lug and the lip 15 and arranged in the groove in the head, there 7 being a clearance betweenthe bottom of the groove and the rounded part of the keeper, and a bolt passing through the grooved part of the head and the rounded part of the keeper for securing the keeper to the head.

14. The combination of a brake head having a' shoe seat thereon and a transverse groove at an end of the seat, a shoe engaging the seat, said shoe comprising a body having a recess in its end and a metal back on said body, a keeper having a lug fitting in said recess to engage the back' and end walls thereof and having shoulders at the ends of the lug engaging end projections on the shoe at the ends of the recess, said keeper having a 4 rounded Ipart to ,enter the groove in the head, and a ho t engagingsaid rooved part of the head and rounded part 0% the keeper for securing the keeper to the head.

15. The combination of a brake head-having a shoe seat thereon and a transverse glroove at an end of the seat, a shoe en aging t e seat, a keeper engagin the shoe and ridging the groove inthe hea said keeper having 40 a. channeled part arranged in said groove, and a bolt passing through the grooved part of the head and the channeled part of the keeper for securing the keeper to the head, the head of the bolt' being shaped to fit in the channel of the keeper.

JAMES S. THOMPSON. 

